If the caller asks you for by name, use some other name. For example, "Hello, may I speak to Jeff?" Reply with, "This is Dan" even if you are Jeff. This will confuse the scammer. Either he will ask again for Jeff, in which case you say "I just shot him in the forehead" or "So I'm not good enough to speak to?" or he'll switch to talking to Dan. If he says, "OK, Dan, I'll talk to you" then you say, "Sorry, but you have to speak with Arlene about that and she's not in right now." Then hang up.